Output Devices - PowerPoint

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Output Devices - PowerPoint Powered By Docstoc
					Discovering Computers
        Output
Output
Data processed into a useable form

 Text (email message, reports)
 Graphics (photos, charts, animated graphics –
    blinking icons)
 Audio (CDs, podcasts, games, chat)
 Video (video blogs, live news report, movie)
Output Device
Hardware that conveys information

 Display Devices
 Printers
 Speakers, headphones, earbuds
 Interactive whiteboards
 Data Projectors
 Force-feedback joysticks and wheels
Display Devices
Visually displays text, graphics and video information

   Soft copy - Appears for temporary period
   Color vs Monochrome (one color other than
    background)
       Phones, Signature Capture Display

   Monitors
       Separate peripheral display device
       Desktops: separate monitor
       Mobile Computer: integrated display
   Types of Monitors
       Flat Panel Displays
       CRT
Flat-Panel Displays
A device with a shallow depth and flat screen

   Displays are measured diagonally from one corner
    to another
   Small footprint – doesn’t take up much desk space
   Types
       LCD Monitors and Screens
       Gas Plasma Monitors
LCD Monitors and Screens
 Liquid Crystal Display
 Florescent tubes emit light waves toward
  liquid crystal cells.
 Electric charge passed through cells
  causing some light waves to be blocked
  (creating color)
 Users may use more than one monitor
 Used in Mobile computing
       Smart Phones, PDAs, Notebooks
Quality Of Monitor
Quality depends on resolution, dot pitch and
  response time, brightness and contrast ratio

   Pixel -The smallest picture element a device can
    display
   Resolution – the number of horizontal and
    vertical pixels in a display
            600 x 480 or 1600 x 1200
       Most monitors support a variety of screen resolutions
       The more pixels the clear the image; however some
        items such as menu bars appear smaller
       Native resolution – check documentation for optimal
        results
Quality Of Monitor
   Dot Pitch (pixel pitch)
       Space between pixels
       The lower the number the sharper the image
   Response Time
       The time it takes in milliseconds to turn a pixel on
        or off. (5 to 16 ms)
       Lower number means faster response time
   Brightness
       A nit is a unit of visual light intensity (250 to 550
        nits)
       The higher the nits the brighter the images
Quality Of Monitor
   Contrast Ratio
       The difference in light intensity between the
        brightest white and darkest black that can be
        displayed.


   Compare Monitors
       http://www.superwarehouse.com/monitors.cf
        m
Plasma Monitors
 Uses gas instead of liquid crystal cells
 Electric charge causes the gas to release
  ultraviolet light which causes pixels to glow
 Offers larger screen size and richer colors,
  but more expensive than LCDs
CRT Monitor
 Cathode Ray Tube – large sealed glass
  tube
 Technology
     Tiny dots of red, green and blue phosphorus
      material coat the screen.
     Electron beam moves across screen causing
      dots to glow
   Refresh Rate instead of Response Time
       Speed monitor redraws images
       Flicker can lead to eye fatigue and headaches.
   CRT Monitor sales are decreasing
CRT vs. Flat Panel
   CRT
       Usually costs less
       Generates more heat and uses more power
       Popularity declining
   Flat-Panel
       Takes up Little Space on Desktop
       Light Weight
       Energy Efficient
       Causing Less Eye Fatigue
Printers
Produce text and graphics on a physical medium such as paper or
   transparency film
 Hard copy
 Impact (pg 322)
     Dot-Matrix – pins strike inked ribbon
         continuous form feed paper/multipart forms
     Line – prints entire line at a time
 Non Impact (pg 315)
     Ink-jet – ink is sprayed on paper
         most popular for home
     Laser – laser beam charges drum, toner sticks to drum and
      is transferred to paper.
         Store an entire page before they print it
         Faster than ink-jet
     Thermal – electric heated pins against heat sensitive paper
         Self-service gas pumps
Special Printers
   Photo Printer
       Produces photo-lab quality pictures
   Mobile Printer
       Small, light weight, battery-powered, wireless
   Label and Postage Printers
       Prints on an adhesive type of material
   Plotters
       Produce high quality drawings such as maps,
        blueprints
       Engineers, Developers
Speakers, Headsets and Earbuds
   Audio Output Devices that produce music,
    speech or other sounds
Other Output Devices
 Data Projectors
 Interactive Whiteboards
 Multi-function Peripherals
       All-in-one printer/scanner/copier
   Force-Feedback Joysticks
Output Devices for Physically
Challenged
   Hearing Impaired
       Program displays text instead of sounds
   Vision Impaired
       Enlarge text on screen
       Voice Output – Computer reads information on
        screen
       Braille Printer
Experiments
   Monitors
       Compare the Price of CRT and LCD Monitors
       www.superwarehouse.com/monitors.cfm
       What type of Monitor do you have?
   Control Panel
       Change the resolution of your monitor
       View Handicap Accessibility Options
   Ink-jet Refill Kits
       http://scsite.com/dc2005/faq (Chapter 6)
 Upload a Video to YouTube (Page 340)
 Locate online movies
Online Movies
   Locations suggested by students
       http://watch-movies-online.tv
       http://tvshack.net (limit 72 minutes per day)
       http://hulu.com
       http://freemediatv.com

				
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